Pets Choice Carp Sticks are a complete, high protein growth and colour enhancing food for all freshwater pond fish. The food has been specially formulated to meet the dietary requirements of Koi carp. The sticks are floating to encourage your fish to feed at the surface of the pond for your enjoyment and to prevent the build up of lost food at the bottom of the pond. The product contains spirulina,a highly nutritious species of filamentous algae from Mexico. Spirulina is a natural colour enhancer that strengthens and fixes" the coloured markings of all breeds of pond fish. Vitamin C builds up the disease resistance and maximises the natural healing of abrasions and wounds in your fish. Pets Choice Carp Food uses a special stabilised form of the micro nutrient that has been specifically formulated and tested for use in aquatic feeds."